GE T60 Instruction Manual page 424

GROUPED ELEMENTS
— Enter the hottest-spot temperature required for operation of the element. Base this setting on the
XFMR HST PICKUP
maximum permissible hottest-spot temperature under emergency transformer loading conditions and maximum ambient
temperature.
— Enter an appropriate time delay before operation of the element.
XFMR HST DELAY
5.7.6.5 Aging factor
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  TRANSFORMER  AGING FACTOR
5
 AGING FACTOR

The Aging Factor element detects transformer aging in per-unit normal insulation aging. The element can be set to alarm
or trip whenever the computed aging factor is greater than the user-defined pickup setting for the specified time delay.
AGING FACTOR PICKUP
maximum permissible aging factor under emergency loading conditions and maximum ambient temperature.
5-242
Figure 5-136: Transformer hottest-spot temperature logic
AGING FACTOR

FUNCTION: Disabled
AGING FACTOR PICKUP:

2.0 pu
AGING FACTOR

DELAY: 10 min.
AGING FACTOR BLOCK:

Off
AGING FACTOR TARGET:

Self-Reset
— Enter a value above which the aging factor element is to operate. Enter a setting greater than the
Range: Disabled, Enabled
Range: 1.1 to 10.0 pu in steps of 0.1
Range: 0 to 30000 min. in steps of 1
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS